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Building Iot Systems with Openhab Matt Porter Konsulko [email protected] Overview

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Building IoT systems with openHAB

Matt Porter
Konsulko [email protected]

Overview

+ Timeline + Frameworks and Protocols + openHAB architecture + openHAB features + openHAB configuration + openHAB examples + Demo

Timeline

+ ARPANET online in 1969 with “things” talking
Network Control Program (NCP)
+ Internet born in 1983: ARPANET “things” start talking TCP/IP
+ Many Internet connected appliances created from
1990 to present
+ Kevin Ashton (Auto-ID) coins “IoT” in 1999 + Media goes into a frenzy about IoT that just won’t quit.
+ openHAB started in 2010

Frameworks

+ AllJoyn - framework for distributed applications

+ https://allseenalliance.org/developers/learn/architecture

+ IOTivity - framework for Machine to Machine(M2M) communication

+ https://www.iotivity.org/

+ Kura - OSGi-based framework for M2M applications

+ https://eclipse.org/kura/

+ Mihini - Lua-based M2M framework

+ https://eclipse.org/mihini/

+ openHAB - Home Automation and IoT gateway framework

+ http://openhab.org

+ ...

Protocols

+ CoAP (Constrained Application Protocol)

+ request/response, low overhead, translates to HTTP

+ MQTT

+ pub/sub, low overhead

+ RESTful HTTP

+ request/response, one way from devices to service

+ XMPP (Extensible Messaging and Presence
Protocol)

+ pub/sub, built in authentication

+ ...

MQTT

+ OASIS standard: MQTT v3.1.1 + Publish/Subscribe and hub/spoke model

+ MQTT brokers provides the communication hub

+ Mosquitto 1.3.4 broker supports MQTT v3.1.1 + Fixed header required, variable header and payload optional

+ Fixed header just 2 bytes

openHAB basics

+ FOSS automation software

+ http://www.openhab.org

+ Eclipse Public License 1.0

+ Written mostly in Java + Central automation hub + Hardware/protocol agnostic

+ Many bindings http://www.openhab.org/features-tech.html

+ Component-based architecture

+ Each component is an OSGi bundle

openHAB architecture

+ Event bus

+ Asynchronous communication bus

+ Repository

+ Persistent storage

+ Items

+ Objects that can be read or written + Have a type and state

+ Bindings

+ Translate event bus events to/from external system

+ Actions

+ Programmatic methods available for use by scripts/rules

openHAB features

+ Plugin framework + Rules engine + Logging mechanism + UI abstraction

+ Sitemap - Tree structure of UI widgets + Item UI Providers - Dynamic UI configuration

+ UI implementations

+ Web + Android + iOS

+ Designer tool - graphic configuration of runtime

openHAB add-ons

+ Actions

+ HTTP - access URL on event + Mail - ancient notification technology + Pushover/Prowl - notifications + Twitter - Tweet that your toilet flushed

+ Bindings

+ Bluetooth - device proximity events
+ GPIO - Linux sysfs-based GPIO events + KNX - home automation events + MQTT - raw protocol support + OneWire - various sensor events + Serial - RS-232 will never die + ZWave - home automation events

Running openHAB

+ Runs well on any x86 or ARM board with 512MB+
RAM
+ OpenJDK or Oracle JREs are supported

+ Some bindings may not work on OpenJDK on ARM

+ Packaged on some distros

+ Debian Cloudbees repository has the core and all bindings packaged

+ openhab-runtime + openhab-addon-*

+ $ cat /etc/apt/sources.list.d/openhab.list deb http://repository-openhab.forge.cloudbees.com/release/1.6.1/apt-repo/ /

openHAB configuration

$(openhab)/configurations/ openhab.cfg items/*.items persistence/*.persist rules/*.rules scripts/*.script sitemaps/*.sitemap transform/*.map

openhab.cfg

######################## Mail Action configuration #################################### ## The SMTP server hostname, e.g. "smtp.gmail.com" mail:hostname=smtp.gmail.com

Global settings are in this config file

# the SMTP port to use (optional, defaults to 25 (resp. 587 for TLS)) mail:port=587

# the username and password if the SMTP server requires authentication mail:username=torvalds mail:password=linux1991

# The email address to use for sending mails mail:from=Not Really Linus <[email protected]>

# set to "true", if TLS should be used for the connection # (optional, defaults to false) mail:tls=true

home.items

Contact FrontDoor "Front Door [MAP(en.map):%s]" {mqtt="<[openhab: /house/frontdoor:state:default]"}

Contact GarageDoor "Garage Door [MAP(en.map):%s]" {zwave="3: command=sensor_binary"}

openHAB rules

+ Java-like

+ Imports + Variable declarations + Rules

var VarType var1 rule “rule name” when
<trigger1> or <trigger2> then
<execute_actions> end

openHAB triggers

+ Item/Event-based

Item <item> received command [<command>] Item <item> changed [from <state>] [to <state>]

+ Time-based

Time is midnight

+ System-based

System started

openHAB actions

+ Actions used in rules engine to accomplish a task + Core actions

sendCommand() postUpdate() logInfo()

+ Binding actions

sendMail() pushNotification() sendTweet() sendXbmcNotification()

home.rules

If the state of the door item changes, send a notification indicating the state of the door.

rule "Notify Front Door" when
Item FrontDoor changed then

end pushover("Front door is " + FrontDoor.state.toString) rule "Notify Garage Door" when
Item GarageDoor changed then

end pushover("Garage door is " + GarageDoor.state.toString)

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